Magmatism in the Asunción-Sapucai-Villarrica Graben (Eastern Paraguay) Revisited: Petrological, Geophysical, Geochemical, and Geodynamic Inferences

Table 4

Representative chemical analyses (recalculated to 100 wt% on anhydrous basis; in parentheses, standard deviation) of Na-alkaline rocks from ASV ASV [13, 74]. Ages as in [4].

Suite: sodic
Na-Alkaline	Ankaratrite	Ankaratrite	Ankaratrite	Melanephelinite	Peralkaline Phonolite
No. of samples	(1)	(1)	(5)	(1)	(1)
Wt%
SiO2	43.71	43.97	43.29 (0.65)	45.67	55.96
TiO2	2.39	2.12	2.50 (0.48)	2.21	0.43
Al2O3	14.84	13.87	13.42 (0.95)	14.83	21.19
FeOtot	10.01	10.44	10.71 (0.40)	7.83	4.04
MnO	0.18	0.21	0.19 (0.01)	0.20	0.22
MgO	10.07	9.87	11.47 (1.23)	8.92	0.21
CaO	12.06	10.81	11.82 (0.28)	10.78	1.34
Na2O	5.15	6.00	4.12 (0.21)	6.73	10.77
K2O	0.89	1.51	1.61 (0.32)	1.54	5.76
P2O5	0.90	1.22	0.88 (0.14)	1.28	0.08
Mg#	0.74	0.72	0.69	0.58	0.22
ppm
La	81	119	84.2 (12.4)	118	120
Ce	145	186	162.8 (24.3)	190	191
Nd	43.4	63.7	55.2 (8.5)	65.1	65
Sm	8.15	11.23	9.4 (1.2)	11.45	11
Eu	1.89	2.15	2.7 (0.3)	2.18	—
Gd	5.77	5.16	6.7 (0.7)	5.23	—
Dy	4.81	4.81	5.5 (0.7)	5.00	—
Er	2.13	2.75	2.4 (0.3)	2.86	—
Yb	1.65	1.79	1.8 (0.3)	1.87	—
Lu	0.23	0.27	0.27 (0.04)	0.28	—
Cr	542	648	490 (74)	470	2
Ni	207	273	249 (48)	239	6
Rb	22	59	53 (13)	63	60
Sr	1016	1013	1109 (63)	1095	654
Ba	1090	980	1090 (95)	1094	367
Th	10.5	10.5	11.0 (2.4)	11.6	—
U	2.3	2.3	2.4 (0.5)	2.5	—
Ta	5.9	5.9	8.4 (1.0)	6.5	—
Nb	86	101	105 (13)	113	—
Zr	152	234	250 (43)	228	955
Y	26	33	29 (4)	32	39
Measured
(^87Sr/^86Sr)	0.70395 (1)	0.70374 (1)	0.70381 (8)	0.70392 (1)	0.70405 (2)
(^143Nd/^144Nd)	0.51275 (1)	0.51276 (1)	0.512724 (61)	0.51274 (2)	0.51268 (2)
Age	46	46	46	50	60
Initial ratio
(^87Sr/^86Sr)i	0.70391	0.70364	0.70373	0.70381	0.70384
(^143Nd/^144Nd)i	0.51272	0.51273	0.51269	0.51271	0.51264
𝑇DM	581	532	562	558	617
𝑅1	582	100	682	18	−1567
𝑅2	2080	1918	2096	1886	570
𝜀Sr	−10.42	−14.30	−13.05	−11.79	−11.19
𝜀Nd	2.67	2.91	2.23	2.57	1.54